AC and DC power supplies
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AC and DC power supplies
AC and DC power supplies displayed on the screen of an oscilloscope (centre). Direct current (DC, the straight line) is produced by the equipment at left, while alternating current (AC, waveform) is produced by the equipment at right. Both currents are powering lamps at lower centre. The grey box (left) is a smoothing unit that is needed to form smooth DC from AC. Many electrical devices need to have the mains AC power supply altered in this way to run safely. The DC supply is seen to be about 0.7 times the peak AC value. This is known as the RMS (root mean square) value
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Media ID 6435543
© ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY
Alternating Current Bulb Bulbs Circuit Circuits Class Room Demonstrating Demonstration Direct Current Education Educational Electrical Electricity Energy Experiment Experimental Experimenting Lamp Lamps Lesson Oscilloscope Power School Supply Wave Form Laboratory Physical Smoothed
EDITORS COMMENTS
This print showcases AC and DC power supplies displayed on the screen of an oscilloscope at the center. On the left side, we can observe direct current (DC) being produced by the equipment, while on the right side, alternating current (AC) is generated. Both currents are effectively powering lamps positioned at the lower center of the image. To convert AC to smooth DC, a grey box known as a smoothing unit is utilized and seen on the left-hand side. The significance of this transformation lies in its ability to ensure safe operation for numerous electrical devices that rely on modified mains AC power supply. The DC supply depicted here measures approximately 0.7 times the peak AC value, which corresponds to its root mean square (RMS) value. This visually striking photograph not only captures a moment in a school laboratory but also symbolizes education and technological advancements in physics and electrical circuits. It serves as a powerful educational tool for students learning about electricity and energy conversion processes. Courtesy of Science Photo Library, this image beautifully encapsulates both practical experimentation and theoretical concepts within one frame – making it an ideal addition to any classroom or educational setting focused on science and technology studies.
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